Capacitive Level Measurement

Physics is Your Friend! Three Tips for Capacitive Level Measurement

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Flexibility for Level Measurement in Tanks and Silos

The device is available for supply voltages of 20-27 VDC, 21-230 VAC or 21-45 VDC and 20-40 VDC. Plus the CN4000 is suitable for all materials of a dielectric value of > 1.6. Through the Atex and IEC Ex approvals, it can be installed in dust and gas explosive environments. UWT has overcome the problem of the material build up and caking on the device often found in storage silos by the use of its active shield technology. Thus, material build up and caking are compensated for and the accurate level limit detection by the device is provided.

Capacitive Level Measurement – Simple and Durable

Other advantages of capacitive measurement systems are:

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  • An exposed/free standing earthed contact is integrated into the thread. This ensures that the grounding is installed automatically via the metal tank.
  • The adjustable delay circuit prevents vibrating switching and allows a hysteresis (the lag in a variable property of a system) of the output signal.
  • Multiple shaft lengths allow for complete customisation of the device according to the application’s requirements.
  • Subsequent adjustments of the unit’s sensitivity are rarely required.

UWT devices are characterised by their simplicity and durability — features that also apply to the new CN 4000. UWT guarantees its products are uniquely maintenance free and corrosion resistant in a wide range of applications. ●

* The author works for UWT GmbH, Betzigau/Germany.

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